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| 1 | <?php |
| 2 | /** |
| 3 | * Images in comments. |
| 4 | * |
| 5 | * @package automattic/jetpack-comments |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Comments; |
| 9 | |
| 10 | /** |
| 11 | * The image block in a comment: a URL a commenter gave, never an upload. The stored comment holds the |
| 12 | * URL as text, so nothing that prints it raw loads it. |
| 13 | */ |
| 14 | class Images { |
| 15 | |
| 16 | /** |
| 17 | * Whether the editor offers the image block, and comments draw the ones they hold. |
| 18 | * |
| 19 | * @return bool |
| 20 | */ |
| 21 | public static function is_enabled() { |
| 22 | /** |
| 23 | * Offer the image block in the Jetpack Comments editor. Off, comments show their images as links. |
| 24 | * |
| 25 | * @since 0.6.0 |
| 26 | * |
| 27 | * @param bool $enabled Whether to offer it. Default true, wherever the block editor is on. |
| 28 | */ |
| 29 | return Block_Editor::is_enabled() && (bool) apply_filters( 'jetpack_comments_block_editor_images', true ); |
| 30 | } |
| 31 | |
| 32 | /** |
| 33 | * The image block as this package writes it: the URL in its attributes, and as the figure's text. |
| 34 | * An http image, one past the comment's limit, or any where images are off or the comment may not |
| 35 | * draw them is a paragraph holding the link. At render, the figure draws the image. |
| 36 | * |
| 37 | * @param array $block Parsed image block. |
| 38 | * @param bool|null $render Null while saving; at render, whether the comment may show the image. |
| 39 | * @param int $count Images the comment has drawn so far, counted up here. |
| 40 | * @return array|null The block to keep, if any. |
| 41 | */ |
| 42 | public static function block( array $block, $render, &$count ) { |
| 43 | // This editor keeps the URL in the attributes; Verbum's kept it on an img. |
| 44 | $tags = new \WP_HTML_Tag_Processor( $block['innerHTML'] ); |
| 45 | $url = $block['attrs']['url'] ?? ( $tags->next_tag( 'img' ) ? $tags->get_attribute( 'src' ) : null ); |
| 46 | |
| 47 | // kses writes & as & in the block's attributes. |
| 48 | $url = is_string( $url ) ? trim( html_entity_decode( $url, ENT_QUOTES ) ) : ''; |
| 49 | $url = strlen( $url ) > 2048 ? '' : esc_url_raw( $url, array( 'http', 'https' ) ); |
| 50 | |
| 51 | if ( ! $url ) { |
| 52 | return null; |
| 53 | } |
| 54 | |
| 55 | $link = Block_Editor::paragraph( '<a href="' . esc_url( $url ) . '" rel="nofollow ugc">' . esc_html( $url ) . '</a>' ); |
| 56 | |
| 57 | // An http image would be mixed content on the https page. Checked before the count, which only |
| 58 | // images that draw use up: four a comment at most. |
| 59 | if ( ! self::is_enabled() || false === $render || 'https' !== wp_parse_url( $url, PHP_URL_SCHEME ) || ++$count > 4 ) { |
| 60 | return $link; |
| 61 | } |
| 62 | |
| 63 | if ( null === $render ) { |
| 64 | $block['attrs'] = array( 'url' => $url ); |
| 65 | $html = '<figure class="wp-block-image">' . esc_html( $url ) . '</figure>'; |
| 66 | } else { |
| 67 | wp_enqueue_style( 'wp-block-image' ); |
| 68 | |
| 69 | $img = new \WP_HTML_Tag_Processor( '<img>' ); |
| 70 | $img->next_tag(); |
| 71 | $img->set_attribute( 'src', $url ); |
| 72 | $img->set_attribute( 'loading', 'lazy' ); |
| 73 | $img->set_attribute( 'decoding', 'async' ); |
| 74 | $img->set_attribute( 'referrerpolicy', 'no-referrer' ); |
| 75 | $img->set_attribute( 'style', 'max-width:100%;height:auto' ); |
| 76 | |
| 77 | $block['attrs'] = array(); |
| 78 | $html = '<figure class="wp-block-image">' . $img->get_updated_html() . '</figure>'; |
| 79 | } |
| 80 | |
| 81 | $block['innerBlocks'] = array(); |
| 82 | $block['innerHTML'] = $html; |
| 83 | $block['innerContent'] = array( $html ); |
| 84 | |
| 85 | return $block; |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * The link, where a caller runs the comment through do_blocks() before `comment_text`, as |
| 90 | * WordPress.com's notifications do: core's own render draws nothing for a figure without an img. |
| 91 | * |
| 92 | * @param string $content What core drew. |
| 93 | * @param array $block Parsed block. |
| 94 | * @return string |
| 95 | */ |
| 96 | public static function render_core( $content, $block ) { |
| 97 | if ( '' !== $content || ! isset( $block['attrs']['url'] ) ) { |
| 98 | return $content; |
| 99 | } |
| 100 | |
| 101 | $count = 0; |
| 102 | $link = self::block( $block, false, $count ); |
| 103 | |
| 104 | return $link ? $link['innerHTML'] : $content; |
| 105 | } |
| 106 | } |